What Is the Purpose of a Hot Tub Pressure Switch?


Hot tubs and spas have pressure switches to protect the heating system from damage if other mechanisms fail or malfunction. Pressure switches also may be called flow switches, depending on the manufacturer.

Switch Location

  • Some pressure switches are located on the front of the hot tub heater. Others are attached to the rear of the heater or to the plumbing leading to the heater.


  • To operate efficiently, the water entering a hot tub must be set at the appropriate pressure and heat levels. The pressure switch regulates how fast water enters the tub and moves cool water over the heating element to prevent overheating, which could ruin the unit. If the pressure drops, this safety gauge shuts down the system.

Adjustment & Maintenance

  • Pressure switches can be calibrated to different levels of sensitivity. Most new hot tubs have pressure switches that are pre-set at the factory. To ensure warranty protection, have a professional adjust pressure switches that repeatedly shut down the hot tub water heating and pumping operations.

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